Bringing Extinct Species Back to Life | Dr. Beth Shapiro
Beth Shapiro, an evolutionary biologist and Colossal Biosciences’ Chief Science Officer, explores humanity’s ancient DNA connections with Neanderthals and Denisovans. She discusses engineering woolly mammoth, dodo, and dire wolf traits, restoring ecosystems, protecting endangered species, gene drives, artificial wombs, and the ethical questions surrounding synthetic biology and human genetic selection.
Top snips
What Is a Species?
3:45 – 6:30
Species are human-made categories — biology itself does not care about our labels.
The classic definition says animals belong to the same species if they can breed and produce fertile offspring. But genetic, geographic, and ecological definitions can tell different stories.
That’s why even familiar labels like “buffalo” can hide completely different evolutionary histories.
Neanderthals Were Part of Us
9:33 – 10:30
Ancient DNA showed that modern humans encountered and interbred with Neanderthals after leaving Africa.
Most people today carry roughly 2–5% Neanderthal DNA — though each person carries different fragments. Across all living humans, researchers can reconstruct more than 90% of the Neanderthal genome.
Biology doesn't care about your species concept.
— Beth Shapiro
How Do You Choose an Extinct Species?
32:04 – 35:58
De-extinction is not just about finding old DNA. A candidate must pass several tests:
- Technical: Is usable DNA preserved?
- Ecological: Is the original niche still available?
- Ethical: Can the animal live safely and humanely?
- Practical: Will the work help conservation?
Dinosaurs are impossible because their DNA is long gone. Mammoths survived because Arctic conditions preserved their remains.
Why Mammoths Could Help Ecosystems
36:21 – 38:03
The goal is not merely to recreate a museum specimen. Mammoth-like animals could restore ecological functions lost with large herbivores.
In Siberia’s Pleistocene Park, bison, horses, deer, and muskox scrape away snow, reshape soil, distribute nutrients, and create a mosaic of wet and dry habitats.
More diverse landscapes can become more resilient to climate and environmental disruption.
Engineering a Dire Wolf
56:41 – 59:38
Colossal sequenced fossil dire-wolf genomes and identified genetic changes linked to a larger body, muscular build, fuller fur, and lighter coloring.
Researchers engineered 20 selected edits into a gray-wolf genome — choosing safer living-dog variants when extinct versions could risk blindness or deafness.
The result is an animal designed to express key dire-wolf traits, not an identical resurrected individual.
De-Extinction Can Save Living Species
1:13:23 – 1:15:23
The same tools used for extinct animals can support endangered ones.
Examples include:
- Cloning black-footed ferrets to restore lost genetic diversity
- Editing northern quolls to resist toxic cane toads
- Cloning red wolves to add diversity to a threatened population
The “spectacle” of mammoths and dire wolves can attract funding and attention to urgent conservation problems.
Doing Nothing Is Still a Decision
1:23:35 – 1:27:22
Synthetic biology and ecosystem restoration carry real risks — but refusing to act also has consequences.
Habitats are changing faster than many species can adapt through natural selection. That means “no intervention” may accept a future with less biodiversity.
Beth Shapiro argues for careful modeling, local advisory panels, staged releases, and transparent public discussion before making ecological changes.